I am fairly new to Quantum Computing and I know a bit of Linear Algebra. I am currently working on the HHL algorithm, I'm having confusion as to how many qubits are actually required in the circuit for an $(N \times N) $ coefficient matrix $A$. Please help!

  • $\begingroup$ Welcome to QCSE. You say you are familiar with linear algebra - great! Can you revise your posting to indicate what you know or what you expect to be the answer? Right now your question is pretty broad. For example, relative to $N$ do you know how many qubits are used to store input vector $\vec b$ as an input register $|b\rangle$, and similarly the number of qubits in your output register $|x\rangle$? $\endgroup$ Commented Aug 29, 2023 at 17:40


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